Moving the engine 1" forward gives me 0.185" more forward CG with 2 185 people and 3 gal of fuel. So, moving the engine 2" more forward puts me at 13.695 with the same weight on board. I am concerned about what length of spacer starts putting you in a bad situation. I can see that a short spacer does not do to much harm, but that a very long one could.
See N64KR at http://KR-Builder.org - Then click on the pics There is a time for building and a time for FLYING and the time for building has expired. Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2005 - KR Gathering